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金属学报  2018, Vol. 54 Issue (9): 1262-1272    DOI: 10.11900/0412.1961.2018.00022
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{332}<113>孪晶与等温ω相的组合对不同O含量Ti-15Mo合金力学性能的影响
闵小华1(), 向力1, 李明佳1, 姚凯1, 江村聪2, 程从前1, 土谷浩一2
1 大连理工大学材料科学与工程学院 大连 116024
2 Research Center for Structural Materials, National Institute for Materials Science, Tsukuba 305-004, Japan
Effect of {332}<113> Twins Combined with Isothermal ω-Phase on Mechanical Properties in Ti-15Mo Alloy with Different Oxygen Contents
Xiaohua MIN1(), Li XIANG1, Mingjia LI1, Kai YAO1, Satoshi EMURA2, Congqian CHENG1, Koichi TSUCHIYA2
1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 Research Center for Structural Materials, National Institute for Materials Science, Tsukuba 305-004, Japan
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摘要: 

利用OM、XRD、TEM、DSC、Vickers硬度计和拉伸试验机等研究了拉伸预变形诱发{332}<113>孪晶与随后时效析出等温ω相对不同O含量(0.1%~0.5%,质量分数) β型Ti-15Mo合金力学性能的影响。结果表明,随着合金中O含量的增加,机械孪晶的形成以及等温ω相的析出受到了抑制,且拉伸预变形诱发孪晶对等温ω相析出的影响较小。经拉伸预变形和随后时效处理,低O含量合金呈现出较高的屈服强度和较好的均匀伸长率,而高O含量合金发生脆性断裂。孪生与位错滑移的耦合塑性变形使得低O含量合金呈现出良好的强度和塑性匹配,其高的屈服强度主要受位错滑移主导,良好的均匀伸长率主要归因于预变形诱发孪晶的静态晶粒细化以及后续孪生变形导致的动态晶粒细化效应。这些结果表明,通过对合金元素O的有效利用,以及合理的预变形与热处理制度,能够改变塑性变形方式和相析出行为,从而在较大范围内调控β型钛合金的强度和塑性匹配。

关键词 β型钛合金;O含量{332}<113>孪晶;等温ω相;力学性能    
Abstract

β-type alloys have a wide application prospect in aerospace, biomedical and marine engineering and other fields, owing to their high specific strength, good corrosion resistance and low elastic modulus. Their yield strength and uniform elongation are affected by the second phase precipitation, plastic deformation mode and interstitial element, especially the oxygen element. In this work, the effect of tensile pre-deformation induced {332}<113> twins combined with isothermal ω-phase after subsequent ageing on the mechanical properties of β-type Ti-15Mo alloy with different oxygen contents from 0.1% to 0.5% (mass fraction) was examined by OM, XRD, TEM and DSC, Vickers hardness tester and tensile testing machine. The results indicated that with increasing the oxygen content, the formation of mechanical twins and isothermal ω-phase in the alloy was suppressed, and the effect of pre-deformation induced twins on the precipitation of isothermal ω-phase was negligible. After pre-deformation combined with subsequent ageing, the alloy with low oxygen content had the relatively high yield strength and large uniform elongation, but it with high oxygen content exhibited the brittle fracture. A good combination of strength with ductility in the alloy with low oxygen content was contributed to the twinning and dislocation slip coupled deformation. The high yield strength was mainly dominated by the dislocation slip, and the large uniform elongation was due to the static and dynamic grain refinement effects, which were caused by the pre-deformation induced twins and subsequent twinning deformation, respectively. Through utilizing the alloying element of oxygen effectively, and changing the plastic deformation mode and phase precipitation behavior based on the reasonable process of pre-deformation and heat treatment, the combination of strength and ductility can be controlled in a large range for the β-type titanium alloys.

Key wordsβ-type titanium alloy;    oxygen content    {332}<113> twin;    isothermal ω-phase;    mechanical property
收稿日期: 2018-01-15     
ZTFLH:  TG146.2  
基金资助:国家自然科学基金项目No.51471040
作者简介:

作者简介 闵小华,男,1974年生,教授,博士

引用本文:

闵小华, 向力, 李明佳, 姚凯, 江村聪, 程从前, 土谷浩一. {332}<113>孪晶与等温ω相的组合对不同O含量Ti-15Mo合金力学性能的影响[J]. 金属学报, 2018, 54(9): 1262-1272.
Xiaohua MIN, Li XIANG, Mingjia LI, Kai YAO, Satoshi EMURA, Congqian CHENG, Koichi TSUCHIYA. Effect of {332}<113> Twins Combined with Isothermal ω-Phase on Mechanical Properties in Ti-15Mo Alloy with Different Oxygen Contents. Acta Metall Sin, 2018, 54(9): 1262-1272.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00022      或      https://www.ams.org.cn/CN/Y2018/V54/I9/1262

图1  0.1O、0.2O和0.4O合金ST 以及STDA 试样的OM像
图2  0.1O、0.2O和0.4O合金ST、STA、STD以及STDA试样的XRD谱
图3  不同O含量Ti-15Mo合金ST、STA、 STD以及STDA试样的β相晶格常数和Vickers硬度
图4  不同O含量Ti-15Mo合金的名义应力-应变曲线
图5  0.1O和0.2O合金ST、STA以及STDA试样的真应力-真应变与加工硬化率曲线
图6  0.1O和0.2O合金STDA试样5%拉伸变形后的OM像
图7  不同O含量Ti-15Mo合金STDA试样变形前和5%拉伸变形后的{332}<113>孪晶面积分数
图8  0.1O合金ST试样的SAED谱、不同O含量Ti-15Mo合金ST试样的衍射斑点强度以及各试样SAED谱中d(0002)ω*/d(222)β*
图9  不同O含量Ti-15Mo合金STA试样的SAED谱及TEM暗场像
图10  不同O含量Ti-15Mo合金ST试样在不同升温速率条件下的DSC曲线
图11  不同O含量Ti-15Mo合金的β相到ω相转变的激活能
图12  0.1O、0.2O和0.4O合金STDA试样5%拉伸变形前后的原位OM像
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